Hitachi RAS-3-HVNC - Drain Piping; Drain Discharging Boss

3. Piping work and refrigerant charge
85
SMGB0079 rev.0 - 01/2013
3
3.7 Drain piping
3.7.1 Drain discharging boss
When the base of the outdoor unit is temporarily utilized as a drain receiver and the drain water in it is discharged, this drain
boss is utilized to connect the drain piping.
Model Applicable Model
DBS-12L
RAS-(2/2.5)HVNP
RAS-3HVNC
DBS-26
RAS-3HVNPE
RAS-(4-6)H(V)N(P/C)E
RAS-(8-10)HN(P/C)E
RAS-12HN(P/C)

Connecting procedure
1 Insert the plastic cap into the drain boss up to the extruded portions.
2 Insert the boss into the unit base up to the extruded portions.
3 Size of the drain boss is:
- For DBS-12L: 15 mm (O.D.)
- For DBS-26: 32 mm (O.D.)
4 A drain pipe should be eld-supplied.
N O T E
• Donotusethisdrainbosssetinacoldarea,becausethedrainwatermayfreeze.
• Thisdrainbossisnotsufcienttocollectallthedrainwater.Ifcollectingdrainwateriscompletelyrequired,
provideadrain-panthatisbiggerthantheunitbaseandinstallitundertheunitwithdrainage.
RAS-(2-2.5)HVNP / RAS-3HVNC
RAS-3HVNPE / RAS-(4-6)H(V)N(P/C)E /
RAS-(8-10)HN(P/C)E / RAS-12HN(P/C)
Drain pipe
Plastic cap
Plastic cap
Drain hole
100 mm
Plastic cap
Drain hole
Push Push
≥ O.D. ∅ 16 mm
Rubber cap
Drain Boss
Extruded portion
Drain pipe
Drain pipe
Drain hole
of Base